The immense power of customization makes the Android most powerful and preferred operating system in the current smartphone and tablet market. You can root the device, customize ROM, install any app you want, use various widgets and lot more you can do with an Android device.
You must be already familiar with the idea of dual booting or multiboot on your computers and devices. It’s also possible to install multiple operating systems on android devices. The idea of multiboot on android devices a becoming popular slowly but the disadvantage is that you have to edit the bootloader, erase all the data and do everything from the scratch. This is not very easy to do and technical that most people choose not to try. But about one year back Tasssadara senior developer at XDA introduced a solution for this problem by introducing an app named MultiROM Manager. The important thing which makes it different from other multiboot solutions, that MultiROM requires no modification of the current /system partition or device’s bootloader. However the app requires modification to the /data partition of the device.
The app was first launched for Nexus 7 (2012), now extended the support to Nexus 4 and Nexus 7 (2013). By installing the MultiROM on your Nexus, you will be able install and boot into any number of Android ROMs. You can also restore from an existing NANDroid backup and use as a secondary ROM on your device. This solution is extremely handy when you want to use a Custom ROM as primary but still can use stock ROM as a dual boot, which will easily help to compare the performances. One other feature introduced in the new version of MultiROM app is to use a USB-OTG cable and connected USB storage to install the ROMs, earlier it could work only from the internal memory.
Disclaimer: This tutorial is exclusively for Nexus 7 (2012), Nexus 4 and Nexus 7 (2013), if you do it on any other device you may brick it. Carefully follow the instructions given below.
Things to Do
- This required ROOT access, make sure your device is rooted.
- Keep your battery charged to at least 80%.
- Take a backup of your important data, I recommend a NANDroid backup. This app won’t erase any data but if anything goes wrong you will be at the safe side if you have a full backup.
- Your device should not be encrypted.
How to Install Multi Boot /Dual Boot on Nexus 4 and Nexus 7
Installing the app is quiet easy, just go to MultiROM Manager to the Play store and then select MultiROM, recovery and kernel on the Install screen and tap Install (Your current ROM will not be affected).
To add a secondary custom ROM (Android)
- Download and copy the new ROM to the device’s memory.
- Open the MultiROM from the apps panel in the Nexus. Go to the option recovery, choose Advanced, select MultiROM and then Add ROM. Select the copies ROM zip file and tap confirm.
- Reboot the device once the installation is complete.
- After the first boot clean installation of stock 4.2.
- You can remove a secondary ROM, by going to Manage ROM -> Rename,Delete and Delete the ROM.
You can visit the official XDA threads below for more information on this topic.
If you face any problem, ask in the official columns or in the comments section here.